overlays: Add PCF85063 and PCF85063A to i2c-rtc

Add support for the PCF85063 and PCF85063A RTC devices to the
i2c-rtc overlay.

Also enable the device to be used on i2c0 (i2c_vc) on GPIOs 0&1 (use
parameter "i2c0") and GPIOs 44 & 45 (use parameter "i2c_csi_dsi").

Signed-off-by: Phil Elwell <phil@raspberrypi.com>